There is a little known suite of programs, written by Peter Weinberger, found as 'btree', or 'cbt', in the archives for Eighth and Tenth Edition. The code in the Eighth Edition archive seems to be the earliest, and has fewer utilities than available in the Tenth Edition code. A search through files shows that it was used by 'road', 'weather' and 'apnews'. There is an ms file, 'memo', describing the programs, amongst the code, but an appendix seems to be missing. If anyone knows about this or where it might be I'd like to get my hands on it. 'Memo' itself is interesting because it's the only troff document I've seen amongst the reseach papers (excluding Christopher Van Wyk's own paper of course) that uses 'ideal', in this case, for drawing a picture depicting B-tree structure.

I see, thanks for that information. I was aware of that paper's existence but I have never read it. I think it was on the old Bell Labs website there was a collection of those CSTRs but I can't seem to find them now. On Sat, 24 Jun 2023 at 22:49, Douglas McIlroy <douglas.mcilroy(a)dartmouth.edu> wrote: > > I used Ideal to make most of the figures in "Getting raster ellipses > right", the first paper in CSTR #155. That paper grew out of a simple > request from Rob Pike for an ellipse-drawing primitive for the Blit. > > Doug > > On Fri, Jun 23, 2023 at 10:34 PM Noel Hunt <noel.hunt(a)gmail.com> wrote: > > > > There is a little known suite of programs, written by Peter Weinberger, > > found as 'btree', or 'cbt', in the archives for Eighth and Tenth > > Edition. > > > > The code in the Eighth Edition archive seems to be the earliest, and > > has fewer utilities than available in the Tenth Edition code. A search > > through files shows that it was used by 'road', 'weather' and > > 'apnews'. > > > > There is an ms file, 'memo', describing the programs, amongst the code, > > but an appendix seems to be missing. If anyone knows about this or > > where it might be I'd like to get my hands on it. > > > > 'Memo' itself is interesting because it's the only troff document I've > > seen amongst the reseach papers (excluding Christopher Van Wyk's own > > paper of course) that uses 'ideal', in this case, for drawing a > > picture depicting B-tree structure.